Collision

[bubudrc]

Hello,

Before all, I love your project.

I'm trying to modify this, because I need create a shape based on line collisions. I mean, If two lines collision, I must join them in the vertex. If, I join more than two line, created a close shape, I must create that shape.

Do you know where can I take a look on that? using your project?

[lll1024]

Thank you,

I don't know if you need the shape was established through linear or graffiti, if it is a straight line, I think it's not difficult to your needs; All shapes was established based on the coordinate, when the two straight lines intersect, you need to decide which should connect the other lines at one end, usually connect one end of the endpoint closer.If the connection point overlaps the starting point, you finished this shape which you can trying to edit, move and even cancel it.

I'm sorry. I did not realize this function. If I have free time I will trying to do it.

[bubudrc]

Hi, thanks for your answer.

Ok, I will try... if I cant do it, I will wait you... If I can, I going to update the fork :D

[bubudrc]

This is what I have:

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    if (![self.layerArray containsObject:self.drawingLayer] && !self.isFirstTouch) {
        [self.layerArray addObject:self.drawingLayer];
        [self.drawingLayer addToTrack];
    } else {
        if (self.isMoveLayer) {
            [self.selectedLayer addToTrack];
        }
        if (self.isFirstTouch) {
            self.selectedLayer.isSelected = NO;
            self.selectedLayer = nil;
            
            UITouch *touch = [touches anyObject];
            CGPoint currentPoint = [touch locationInView:self];
            for (JVDrawingLayer *layer in self.layerArray) {
                if ([layer caculateLocationWithPoint:currentPoint]) {
                    self.selectedLayer = layer;
                    self.selectedLayer.isSelected = YES;
                    [self.layerArray removeObject:self.selectedLayer];
                    [self.layerArray addObject:self.selectedLayer];
                    break;
                }
            }
            
            self.drawingLayerSelectedBlock(self.selectedLayer);
        } else {
            
            NSInteger index = [self.layerArray indexOfObject:self.selectedLayer];

            [self.layerArray enumerateObjectsUsingBlock:^(JVDrawingLayer *layer, NSUInteger idx, BOOL * _Nonnull stop) {
                if(idx != index) {
                    if([self distanceBetween:layer.startPoint and:self.selectedLayer.startPoint] <= 10 ||
                       [self distanceBetween:layer.startPoint and:self.selectedLayer.endPoint] <= 10 ||
                       [self distanceBetween:layer.endPoint and:self.selectedLayer.startPoint] <= 10 ||
                       [self distanceBetween:layer.endPoint and:self.selectedLayer.endPoint] <= 10){
                        NSLog(@"Intersection: %@", layer);
                        
                        *stop = YES;
                        return;
                    }
                }
            }];
        }
    }
}

- (float)distanceBetween:(CGPoint)p1 and:(CGPoint)p2
{
    return sqrt(pow(p2.x-p1.x,2)+pow(p2.y-p1.y,2));
}

What do you think? do you have a better way to do it?